含氯消毒剂的大规模使用势必导致其残留物通过降雨径流等途径进入天然水体造成余氯污染。为探究余氯在湖泊中的时空分布规律,采用Infoworks ICM仿真平台建立南湖水动力-水质模型,分析不同加氯周期和降雨条件下南湖余氯浓度时空变化。结果表明:① 余氯单次排入时,首先于近岸水体形成高余氯浓度区,由湖岸向湖心扩散且浓度递减;余氯输入结束时,浓度达到峰值1.25 mg/L,随后逐步衰减,余氯衰减趋向呈水域中心指向边界;全过程历时约14 h。② 周期性排入的影响主要体现在新周期余氯衰减速率有所减小,衰减历时增加且余氯浓度峰值有所增加,3个周期峰值分别为1.25、1.58、1.89 mg/L,历时分别为14、15.7、17.1 h。③ 降雨影响下,余氯污染范围增大,向湖心深入;历时更长,约20 h,浓度峰值增加,达到7 mg/L。
Abstract
The widespread use of chlorine-containing disinfectants inevitably leads to chlorine pollution as residues enter natural water bodies through rainfall runoff. To investigate the temporal and spatial distribution of chlorine in lakes, a hydrodynamic-water quality model of Nanhu Lake was established using the Infoworks ICM simulation platform. The model was used to analyze the temporal and spatial variation of chlorine concentration in Nanhu Lake under different chlorine discharge cycles and rainfall conditions. The results indicated that: 1) During a single discharge, a high concentration zone of chlorine was initially formed in the nearshore water body. The chlorine diffused from the lakeshore to the lake center, where the concentration decreased. At the end of chlorine discharge, the concentration reached a peak value of 1.25 mg/L and gradually decreased, with chlorine concentration attenuating from the water center towards the boundary. This process lasted approximately 14 hours. 2) The influence of periodic inflow is mainly reflected in the decrease of chlorine decay rate in the new cycle. The decay duration increased, and the peak value of chlorine concentration also increased. The peak values of chlorine concentration in three cycles were 1.25 mg/L, 1.58 mg/L, and 1.89 mg/L, respectively, with decay durations being 14 hours, 15.7 hours, and 17.1 hours, respectively. 3) Under the influence of rainfall, the range and depth of chlorine pollution expanded towards the lake center, and the pollution duration increased to approximately 20 hours. The peak concentration of chlorine also increased, reaching up to 7 mg/L.
关键词
水环境 /
余氯 /
时空分布 /
含氯消毒剂 /
Infoworks ICM /
南湖
Key words
water environment /
residual chlorine /
spatial and temporal distribution /
chlorine-containing disinfectant /
Infoworks ICM /
Nanhu Lake
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基金
武汉市科技计划项目(2020020201010021)
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